1 /* $NetBSD: svc_vc.c,v 1.7 2000/08/03 00:01:53 fvdl Exp $ */
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
27 * Sun Microsystems, Inc.
29 * Mountain View, California 94043
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *sccsid2 = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC";
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
40 * svc_vc.c, Server side for Connection Oriented based RPC.
42 * Actually implements two flavors of transporter -
43 * a tcp rendezvouser (a listner and connection establisher)
44 * and a record/tcp stream.
47 #include "namespace.h"
48 #include "reentrant.h"
49 #include <sys/types.h>
50 #include <sys/param.h>
52 #include <sys/socket.h>
56 #include <netinet/in.h>
57 #include <netinet/tcp.h>
72 #include "un-namespace.h"
74 static SVCXPRT *makefd_xprt(int, u_int, u_int);
75 static bool_t rendezvous_request(SVCXPRT *, struct rpc_msg *);
76 static enum xprt_stat rendezvous_stat(SVCXPRT *);
77 static void svc_vc_destroy(SVCXPRT *);
78 static void __svc_vc_dodestroy (SVCXPRT *);
79 static int read_vc(void *, void *, int);
80 static int write_vc(void *, void *, int);
81 static enum xprt_stat svc_vc_stat(SVCXPRT *);
82 static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *);
83 static bool_t svc_vc_getargs(SVCXPRT *, xdrproc_t, void *);
84 static bool_t svc_vc_freeargs(SVCXPRT *, xdrproc_t, void *);
85 static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *);
86 static void svc_vc_rendezvous_ops(SVCXPRT *);
87 static void svc_vc_ops(SVCXPRT *);
88 static bool_t svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in);
89 static bool_t svc_vc_rendezvous_control (SVCXPRT *xprt, const u_int rq,
92 struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
98 struct cf_conn { /* kept in xprt->xp_p1 for actual connection */
99 enum xprt_stat strm_stat;
102 char verf_body[MAX_AUTH_BYTES];
107 struct timeval last_recv_time;
112 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
114 * Creates, registers, and returns a (rpc) tcp based transporter.
115 * Once *xprt is initialized, it is registered as a transporter
116 * see (svc.h, xprt_register). This routine returns
117 * a NULL if a problem occurred.
119 * The filedescriptor passed in is expected to refer to a bound, but
120 * not yet connected socket.
122 * Since streams do buffered io similar to stdio, the caller can specify
123 * how big the send and receive buffers are via the second and third parms;
124 * 0 => use the system default.
127 svc_vc_create(fd, sendsize, recvsize)
133 struct cf_rendezvous *r = NULL;
134 struct __rpc_sockinfo si;
135 struct sockaddr_storage sslocal;
138 if (!__rpc_fd2sockinfo(fd, &si))
141 r = mem_alloc(sizeof(*r));
143 warnx("svc_vc_create: out of memory");
144 goto cleanup_svc_vc_create;
146 r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
147 r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
148 r->maxrec = __svc_maxrec;
149 xprt = mem_alloc(sizeof(SVCXPRT));
151 warnx("svc_vc_create: out of memory");
152 goto cleanup_svc_vc_create;
158 xprt->xp_verf = _null_auth;
159 svc_vc_rendezvous_ops(xprt);
160 xprt->xp_port = (u_short)-1; /* It is the rendezvouser */
163 slen = sizeof (struct sockaddr_storage);
164 if (_getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
165 warnx("svc_vc_create: could not retrieve local addr");
166 goto cleanup_svc_vc_create;
169 xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len;
170 xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
171 if (xprt->xp_ltaddr.buf == NULL) {
172 warnx("svc_vc_create: no mem for local addr");
173 goto cleanup_svc_vc_create;
175 memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);
177 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
180 cleanup_svc_vc_create:
182 mem_free(xprt, sizeof(*xprt));
184 mem_free(r, sizeof(*r));
189 * Like svtcp_create(), except the routine takes any *open* UNIX file
190 * descriptor as its first input.
193 svc_fd_create(fd, sendsize, recvsize)
198 struct sockaddr_storage ss;
204 ret = makefd_xprt(fd, sendsize, recvsize);
208 slen = sizeof (struct sockaddr_storage);
209 if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
210 warnx("svc_fd_create: could not retrieve local addr");
213 ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
214 ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
215 if (ret->xp_ltaddr.buf == NULL) {
216 warnx("svc_fd_create: no mem for local addr");
219 memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);
221 slen = sizeof (struct sockaddr_storage);
222 if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
223 warnx("svc_fd_create: could not retrieve remote addr");
226 ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
227 ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
228 if (ret->xp_rtaddr.buf == NULL) {
229 warnx("svc_fd_create: no mem for local addr");
232 memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
234 if (ss.ss_family == AF_INET || ss.ss_family == AF_LOCAL) {
235 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
236 ret->xp_addrlen = sizeof (struct sockaddr_in);
243 if (ret->xp_ltaddr.buf != NULL)
244 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);
250 makefd_xprt(fd, sendsize, recvsize)
258 struct __rpc_sockinfo si;
262 xprt = mem_alloc(sizeof(SVCXPRT));
264 warnx("svc_vc: makefd_xprt: out of memory");
267 memset(xprt, 0, sizeof *xprt);
268 cd = mem_alloc(sizeof(struct cf_conn));
270 warnx("svc_tcp: makefd_xprt: out of memory");
271 mem_free(xprt, sizeof(SVCXPRT));
275 cd->strm_stat = XPRT_IDLE;
276 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
277 xprt, read_vc, write_vc);
279 xprt->xp_verf.oa_base = cd->verf_body;
280 svc_vc_ops(xprt); /* truely deals with calls */
281 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
283 if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
284 xprt->xp_netid = strdup(netid);
293 rendezvous_request(xprt, msg)
298 struct cf_rendezvous *r;
300 struct sockaddr_storage addr;
302 struct __rpc_sockinfo si;
306 assert(xprt != NULL);
309 r = (struct cf_rendezvous *)xprt->xp_p1;
312 if ((sock = _accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
317 * Clean out the most idle file descriptor when we're
320 if (errno == EMFILE || errno == ENFILE) {
321 cleanfds = svc_fdset;
322 __svc_clean_idle(&cleanfds, 0, FALSE);
328 * make a new transporter (re-uses xprt)
330 newxprt = makefd_xprt(sock, r->sendsize, r->recvsize);
331 newxprt->xp_rtaddr.buf = mem_alloc(len);
332 if (newxprt->xp_rtaddr.buf == NULL)
334 memcpy(newxprt->xp_rtaddr.buf, &addr, len);
335 newxprt->xp_rtaddr.len = len;
337 if (addr.ss_family == AF_INET || addr.ss_family == AF_LOCAL) {
338 newxprt->xp_raddr = *(struct sockaddr_in *)newxprt->xp_rtaddr.buf;
339 newxprt->xp_addrlen = sizeof (struct sockaddr_in);
342 if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) {
344 /* XXX fvdl - is this useful? */
345 _setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len));
348 cd = (struct cf_conn *)newxprt->xp_p1;
350 cd->recvsize = r->recvsize;
351 cd->sendsize = r->sendsize;
352 cd->maxrec = r->maxrec;
354 if (cd->maxrec != 0) {
355 flags = _fcntl(sock, F_GETFL, 0);
358 if (_fcntl(sock, F_SETFL, flags | O_NONBLOCK) == -1)
360 if (cd->recvsize > cd->maxrec)
361 cd->recvsize = cd->maxrec;
363 __xdrrec_setnonblock(&cd->xdrs, cd->maxrec);
365 cd->nonblock = FALSE;
367 gettimeofday(&cd->last_recv_time, NULL);
369 return (FALSE); /* there is never an rpc msg to be processed */
373 static enum xprt_stat
374 rendezvous_stat(xprt)
385 assert(xprt != NULL);
387 xprt_unregister(xprt);
388 __svc_vc_dodestroy(xprt);
392 __svc_vc_dodestroy(xprt)
396 struct cf_rendezvous *r;
398 cd = (struct cf_conn *)xprt->xp_p1;
400 if (xprt->xp_fd != RPC_ANYFD)
401 (void)_close(xprt->xp_fd);
402 if (xprt->xp_port != 0) {
403 /* a rendezvouser socket */
404 r = (struct cf_rendezvous *)xprt->xp_p1;
405 mem_free(r, sizeof (struct cf_rendezvous));
408 /* an actual connection socket */
409 XDR_DESTROY(&(cd->xdrs));
410 mem_free(cd, sizeof(struct cf_conn));
412 if (xprt->xp_rtaddr.buf)
413 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
414 if (xprt->xp_ltaddr.buf)
415 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
419 free(xprt->xp_netid);
420 mem_free(xprt, sizeof(SVCXPRT));
425 svc_vc_control(xprt, rq, in)
434 svc_vc_rendezvous_control(xprt, rq, in)
439 struct cf_rendezvous *cfp;
441 cfp = (struct cf_rendezvous *)xprt->xp_p1;
445 case SVCGET_CONNMAXREC:
446 *(int *)in = cfp->maxrec;
448 case SVCSET_CONNMAXREC:
449 cfp->maxrec = *(int *)in;
458 * reads data from the tcp or uip connection.
459 * any error is fatal and the connection is closed.
460 * (And a read of zero bytes is a half closed stream => error.)
461 * All read operations timeout after 35 seconds. A timeout is
462 * fatal for the connection.
465 read_vc(xprtp, buf, len)
472 int milliseconds = 35 * 1000;
473 struct pollfd pollfd;
476 xprt = (SVCXPRT *)xprtp;
477 assert(xprt != NULL);
481 cfp = (struct cf_conn *)xprt->xp_p1;
484 len = _read(sock, buf, (size_t)len);
492 gettimeofday(&cfp->last_recv_time, NULL);
498 pollfd.events = POLLIN;
500 switch (_poll(&pollfd, 1, milliseconds)) {
511 } while ((pollfd.revents & POLLIN) == 0);
513 if ((len = _read(sock, buf, (size_t)len)) > 0) {
514 gettimeofday(&cfp->last_recv_time, NULL);
519 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
524 * writes data to the tcp connection.
525 * Any error is fatal and the connection is closed.
528 write_vc(xprtp, buf, len)
536 struct timeval tv0, tv1;
538 xprt = (SVCXPRT *)xprtp;
539 assert(xprt != NULL);
541 cd = (struct cf_conn *)xprt->xp_p1;
544 gettimeofday(&tv0, NULL);
546 for (cnt = len; cnt > 0; cnt -= i, buf = (char *)buf + i) {
547 i = _write(xprt->xp_fd, buf, (size_t)cnt);
549 if (errno != EAGAIN || !cd->nonblock) {
550 cd->strm_stat = XPRT_DIED;
553 if (cd->nonblock && i != cnt) {
555 * For non-blocking connections, do not
556 * take more than 2 seconds writing the
559 * XXX 2 is an arbitrary amount.
561 gettimeofday(&tv1, NULL);
562 if (tv1.tv_sec - tv0.tv_sec >= 2) {
563 cd->strm_stat = XPRT_DIED;
573 static enum xprt_stat
579 assert(xprt != NULL);
581 cd = (struct cf_conn *)(xprt->xp_p1);
583 if (cd->strm_stat == XPRT_DIED)
585 if (! xdrrec_eof(&(cd->xdrs)))
586 return (XPRT_MOREREQS);
591 svc_vc_recv(xprt, msg)
598 assert(xprt != NULL);
601 cd = (struct cf_conn *)(xprt->xp_p1);
605 if (!__xdrrec_getrec(xdrs, &cd->strm_stat, TRUE))
608 (void)xdrrec_skiprecord(xdrs);
611 xdrs->x_op = XDR_DECODE;
612 if (xdr_callmsg(xdrs, msg)) {
613 cd->x_id = msg->rm_xid;
616 cd->strm_stat = XPRT_DIED;
621 svc_vc_getargs(xprt, xdr_args, args_ptr)
627 assert(xprt != NULL);
628 /* args_ptr may be NULL */
629 return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs),
634 svc_vc_freeargs(xprt, xdr_args, args_ptr)
641 assert(xprt != NULL);
642 /* args_ptr may be NULL */
644 xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);
646 xdrs->x_op = XDR_FREE;
647 return ((*xdr_args)(xdrs, args_ptr));
651 svc_vc_reply(xprt, msg)
659 assert(xprt != NULL);
662 cd = (struct cf_conn *)(xprt->xp_p1);
665 xdrs->x_op = XDR_ENCODE;
666 msg->rm_xid = cd->x_id;
667 rstat = xdr_replymsg(xdrs, msg);
668 (void)xdrrec_endofrecord(xdrs, TRUE);
676 static struct xp_ops ops;
677 static struct xp_ops2 ops2;
679 /* VARIABLES PROTECTED BY ops_lock: ops, ops2 */
681 mutex_lock(&ops_lock);
682 if (ops.xp_recv == NULL) {
683 ops.xp_recv = svc_vc_recv;
684 ops.xp_stat = svc_vc_stat;
685 ops.xp_getargs = svc_vc_getargs;
686 ops.xp_reply = svc_vc_reply;
687 ops.xp_freeargs = svc_vc_freeargs;
688 ops.xp_destroy = svc_vc_destroy;
689 ops2.xp_control = svc_vc_control;
692 xprt->xp_ops2 = &ops2;
693 mutex_unlock(&ops_lock);
697 svc_vc_rendezvous_ops(xprt)
700 static struct xp_ops ops;
701 static struct xp_ops2 ops2;
703 mutex_lock(&ops_lock);
704 if (ops.xp_recv == NULL) {
705 ops.xp_recv = rendezvous_request;
706 ops.xp_stat = rendezvous_stat;
708 (bool_t (*)(SVCXPRT *, xdrproc_t, void *))abort;
710 (bool_t (*)(SVCXPRT *, struct rpc_msg *))abort;
712 (bool_t (*)(SVCXPRT *, xdrproc_t, void *))abort,
713 ops.xp_destroy = svc_vc_destroy;
714 ops2.xp_control = svc_vc_rendezvous_control;
717 xprt->xp_ops2 = &ops2;
718 mutex_unlock(&ops_lock);
722 * Get the effective UID of the sending process. Used by rpcbind, keyserv
723 * and rpc.yppasswdd on AF_LOCAL.
726 __rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) {
732 sock = transp->xp_fd;
733 sa = (struct sockaddr *)transp->xp_rtaddr.buf;
734 if (sa->sa_family == AF_LOCAL) {
735 ret = getpeereid(sock, &euid, &egid);
744 * Destroy xprts that have not have had any activity in 'timeout' seconds.
745 * If 'cleanblock' is true, blocking connections (the default) are also
746 * cleaned. If timeout is 0, the least active connection is picked.
749 __svc_clean_idle(fd_set *fds, int timeout, bool_t cleanblock)
752 SVCXPRT *xprt, *least_active;
753 struct timeval tv, tdiff, tmax;
756 gettimeofday(&tv, NULL);
757 tmax.tv_sec = tmax.tv_usec = 0;
759 rwlock_wrlock(&svc_fd_lock);
760 for (i = ncleaned = 0; i <= svc_maxfd; i++) {
761 if (FD_ISSET(i, fds)) {
762 xprt = __svc_xports[i];
763 if (xprt == NULL || xprt->xp_ops == NULL ||
764 xprt->xp_ops->xp_recv != svc_vc_recv)
766 cd = (struct cf_conn *)xprt->xp_p1;
767 if (!cleanblock && !cd->nonblock)
770 timersub(&tv, &cd->last_recv_time, &tdiff);
771 if (timercmp(&tdiff, &tmax, >)) {
777 if (tv.tv_sec - cd->last_recv_time.tv_sec > timeout) {
778 __xprt_unregister_unlocked(xprt);
779 __svc_vc_dodestroy(xprt);
784 if (timeout == 0 && least_active != NULL) {
785 __xprt_unregister_unlocked(least_active);
786 __svc_vc_dodestroy(least_active);
789 rwlock_unlock(&svc_fd_lock);
790 return ncleaned > 0 ? TRUE : FALSE;